A directory of skins as well as a skin builder tool is available at skins.wmflabs.org.
|Desired outcome||How to do it|
|Choose a skin only for you on a site you may not own||Help:Skins|
|Create or modify a skin for yourself or for others||Manual:How to make a MediaWiki skin|
|Choose or configure a skin for your MediaWiki installation||$wgDefaultSkin, Manual:Skin configuration|